class Container {
	static of(value) {
		return new Container(value)
	}

	constructor(value) {
		this._value = value
	}

	map(fn) {
		return Container.of(fn(this._value))
	}
}

class MayBe {
	static of(value) {
		return new MayBe(value)
	}

	constructor(value) {
		this._value = value
	}

	isNothing() {
		return this._value === null || this._value === undefined
	}

	map(fn) {
		return this.isNothing() ? this : MayBe.of(fn(this._value))
	}
}

module.exports = { Container, MayBe }
